Operating dampebs of furnaces



- 2 Sheets-Sheet 1-.- D. TREADWELL Damper.

No. 11,583. Patented Aug. 22, I854.

Fay Z Y 2 4A I In vaw '2 Sheets-Sheet 2. D. TREADWELL.

Damper. No. 11,583. Patented Aug. 22,1854.

7&270 $6 5 as In ery/Z 07 UNITED STATES PATENT OFFICE.

DANIEL TREADWELL,

OF CAMBRIDGE, MASSACHUSETTS,,ASSIGNOR TO H. H. AND F. STIMPSON, OFBOSTON, MASSACHUSETTS.

OPERATING D AMPERS OF FURNACES.

I have set.forth the nature and principles of my said improvements, bywhich my invention may be distinguished from others of a similar class,together with such parts as I claim and desire to have secured to me byLetters Patent.

The figures of the accompanying plate of drawings represent myimprovements.

Figure 1 is a plan or top view of a furnace, with my improvementsapplied thereto.

Fig. 2 is a central transverse vertical section.

of the same.

The object of my invention,is to render the damper or valve of afurnace, or stove, self-acting, or so as to be closed by the expansionof thefurnace itself, and thereby prevent it from being overheated,which is the main cause of their burning or wearing out. I am aware thatstoves have been C011".

structed, in which the damper was closed by devices actuated by theexpansion of a metallic tube or bar, but all these devices difi'er frommy invention, inasmuch as they are designed both to open and close thedamper,

I by acting directly upon the same, whereas my invention is intendedmerely to withdraw a catch and permit the weight or spring to close thedamper, without ever operl'ing the same, the force for withdrawing thecatch, being the expansion of the stove or furnace itself.

a a a in the drawings represents the outer casing or brickwork of afurnace, and b b b the metallic body of the same, 0, is the smoke flue,and d the damper or valve, to be closed at the proper time by theexpansion of the furnace. The damper cl turns on a pivot e, forming apart or extension of a bent rod f, attached to a sliding bar .9. The bar9 is fastened by a pivot h, to a right angular lever z', turning on afulcrum k, and having attached to one end a weight Z. Upon theSpecification of Letters Patent No. 11,583, dated August 22, 1854:.

top of the stove or furnace, is placed a bar or lever turning, on afulcrum at n, and having attached to its outer end a bolt or catch 0,made adjustable so as to be moved up or down by a set screw 19, as shownin Fig. 2. This bolt 0 fits into a notch of the sliding bar 9, and whenengaged with the said notch, the parts will be in the position.

shown in Fig. 2, and the damper or valves thereby held open, to allowthe smoke free exit through the smoke flue. The bolt 0 is first made toengage with the notch of the bar 9, by simply pulling out the said baruntil the bolt. catches inthe notch of the same, when the damper will beheld open. When the furnace has become sufliciently heated, theexpansion of the same will lift the inner end of thelever m, and thusdepress the otherend, and disengage its bolt 0 from the notch of thesliding bar g, which will by means of the weight Z and angular lever 2',be retracted, and receive sufficient motion to turn the bent rod f, andthus close the damper.

From the foregoing description it will beseen, that the bolt or catch 0can be so adjusted by means of the set screw 19, with regard to thesliding bar 9, as to be disengaged from the notch of the same, andthereby cause the damper to shut, by the slightest movement of the baror lever m, and thus that the amount of heat to which the furnace shallbe exposed, before the damper or valve in the smoke flue is closed, canbe regulated at pleasure.

It will be evident, that the damper instead of operating to close thepassage which leads directly to the delivering flue, may be so appliedas to cause the smoke or other products of combustion, to pass through aradiator.

It will further be obvious, that any other suitable arrangement ofdevices, may be substituted for those herein described, as the mediumthrough which the expansion of the stove orfurnace acts upon the damper,without varying the essential features of my invention.

An obvious modification of form without changing the principle of myinvention will be, to make the damper turn upon a horizontal axis, andmake one side of the damper heavier than the other. By this means thedamper will turn and close by its own Weight Whenever the catch 0 isremoved. In this form the Weight Z and lever i may be dispensed With.

Having thus described my improvements,

5 I shall state my claims as follows:

What I claim as my invention and desire to have secured to me by LettersPatent, is

Using the expansion of the stove or fur-

